bellows intercommunicating gangway

例句：

1. 1. The bellows were usedto control the temperature of the furnace.
   风箱用于控制炉温。
2. 2. Thebellows were usedto ventilate the room.
   风箱用于通风房间。
3. 3. The bellows were used to power the machine.
   风箱用于驱动机器。